Electromagnetic relay.



G. GRABE.

ELECTROMAGNETIC RELAY. APPHCATION HLED 050.21.19os.

1 274,874. Patented Aug. 6, 1918.

Znesses UNITED STATES PATENT OFFICE.

GEOBE GRABE, OF MKOLASSEE, NEAR BERLIN. GERMANY, ASSIGNOR TO SIEMENE? & HALSKE .A.-G., F SIEMENSSTADT, NEAR BERLIN, GERMANY, A CORPORATION-OF GERM ANY.

ELECTROMAGNETIC RELAY Specification of Letters Patent.

Patented Aug. 6, 1915.

Application filed December 27, 1915. Serial No. 68,870.

, T 0 all whom it may (OTLUCT/t'.

tromagnetic relays, the armature and sets of Be it known that I, Gecko GRABE, a citizen of 'the Gemian Empire, residing at Nikolassee. near Berlin, Germany, have in vented certain new and useful Impro vcmerits in Electromagnetic Relays, of which the following is a specification, reference being had therein to the accompanying drawin s.

he invention relates to the type of eleccontact springs of which extend parallel to the core and have their movable ends areasy access to the movable ends of same. -,Such a relay is capable'ofespecially advantageous use in connection with telephone exchanges. For obtaining a favorable'course of the lines of force and therewith a great efliciency of the relay, the pole pieces are welded with a large the ends of the side surface or on the front surfaces of the core and. their breadth is successively increasing from the breadth on the core to that of the armature. Further the armature rearranged between the contact springs and great resistance when H the winding of the core and moves upon energization of the magnet toward the core, so that its attraction is assisted by the leakage fielclof the magnetic flow of the lines of force. The seat of the armature at its rear. end is further so arranged, that the armature abuts in its operative position with a large surface upon a plate attached to the rear polepiece, so that the flow of the lines of force has not to overcome a owing from the pole piece to the armature.

In order to have a free access to the movable ends of the contact springs and of the armature, when the relay is inserted in position, the motion of the armature is trans mittcd to the contact springs by means of intermediate studs abutting the contact springs at points behind thc contacts.

In'the drawings: Figure 1 is a side view shown in Fi of a relay constructed in ac;ordance"with my invention and Fig. 2 is a 'front end view of the same. In these figures the'make and break devices have been omitted for' more clcarness. Fig. 3 is a top view of a com- .plete relay with four sets of Contact springs.

Fig. 4 is aside view, and Fig. 5 is a'front end view of the same. In- Fig. 5 two sets of springs have been omitted 'for more clearness. r

In theembodiment shownin Figs. 1- and 2, the core a has a fiat cross section and is" arranged with its large sidc surfa'ce's' parallcl to the flat armature b. The core is surrounded by the winding 0 a-nd'sup'p'orts the pole pieces (1 and e, which are welded on the end parts of theupper large-side surface of the core. The ole pieces extend upwardly andtheir b'r'ea th is successively increasing from that of the core to that of the'armature. ,The front pole piece extends somewhat beyond the'core so as to form a shoulder serving as'a stop for a'yoke fettached to the free front endof the armature. Instead of welding the pole pieceson .the broad side surface of the corefithey' might also be welded on-the narrow side surfaces of the same, which latter 1 surfaces 'WUlfld,

then extend parallel to the-armature. The arrangement shown in the drawingsishowever to be preferred, inasmuch as by it the distance between'theaxes of t and the core is shortened.

In the embodiment of the inventionaecording to Figs. 3 to 5 the core a, the armature b, the winding c and the pole pieces d and e are arranged in the same rnanner' as .land? To the po e piece 0! is fixed alate of magnetic material, for instance s eet iron serving as a support for the armature and the make and break devices, consistin of four sets 10,-, In 70,, k, of contact springs, which comprise each three spri 1 Z,, 1,. The armature bis connected to t e plate 9 by means of a blade spring 6', arranged between the plate g and the sets'bf contact springs. The arrangement is such that the armature when attracted abuts With its large upper side surface upon the lower side surface of the Plate q. By this arrangement it is possible to adjust the contact s rings before they are fixed to the relay and rther an easy passage of the lines of force from shaped as shown.

s ppntact springs l, and Z,

the pole piece (1 and the plate 9 to the armature b isobtained. To the free end of the arm'ature b is attached a piece It, 2' of nonmagnetic material, for instance brass, and The are sha ,ed part It extends beneath the protruding s oulder of the pole piece e and the parti nsists of two cli shaped members whic are arranged between the sets of contact springs and rest with their upper ends on lateral extensions gr of the middle springs 1 of the several sets.

When the relay is energized, the armature moves downwardly and this motion is assisted by the magnetic stray lines emerging within the extent of the winding.

The armature moves by the intermediance of the parts i the middle contact springs Z, also downwardly, whereby the contact with the upper springs Z is broken and the contact with-the springs 1 is made. When the relay is deenergized the final position of the armature and of the contact springs 15 determined by the member h abutting the shoulder of the pole iece 0.

Between the sets 0 contact springs 16 k, and 7a,, is are provided supports 14, which are attached with one end by means of screws to the sets of contact springs and the pole piece d, while they serve with their other end as a stop for lateral extensions g of the contact springs Z l,. The supports it are novided with extensionsm, which protrude ween the ,sets of contact springs and are shaped so that they. may be gripped with a tool introduced from the front side of the *relay for adjustin the supports n.

For adjustin t e relay, the are shaped piece It is at rstbent' for changing the stroke of the armature and adjusting the contact springs b means of the abutting pieces i. The further adjustment of the set .ofcontact springs is efi'ectuated by bending the; supports n, The extensions 0 of the are dprovided at such "ga distance from the free en s. of the springs,

"that the adjustment of the contacts may also be attained by bending the part of. the springs between the extensions 0 and the contacts A further adjustment may be obtained by bending the upper clip like members i.

I claim:

2. In an electromagnetic relay with a flat armature extending parallel to the core, the combination of the armature rovided between the contact springs and t eenergizing winding on the coil, several sets of contact springs juxtaposed, adjustable means arranged between the sets of contact springs, which engage the contact springs and are secured to the armature and adjustable supports, which hold the upper and, lower springs of a set in their inoperat've position.

3. In an electromagnetic relay ith a fiat armature extending parallel to the core, the combination of an armature rovided between the contact springs and t e energizing winding on the coil, and a blade spring clamps with one and between the rear pole piece and a plate of magnetic material and attached with the other end to the armature so that the latter, when attracted, bears with its upper broad surface on the portion of the blade spring connected to the magnetic plate.

In witness whereof, I hereunto subscribe my name this 27th day of November 'A; D. 1915. 1

GEORG GRABE.

' HENRY Hssrna, Lmm FRANK. 

